Incoming SMTP in the year 2017 and absence of DKIM

Thu Nov 30 08:53:26 UTC 2017

Hi

> For those who operate public facing SMTPd that receive a large volume
> of incoming traffic, and accordingly, a lot of spam...
> 
> How much weight do you put on an incoming message, in terms of adding
> additional score towards a possible value of spam, for total absence
> of DKIM signature?

No DKIM = not scored.

DKIM is not widely used and DKIM does break a lot of mailinglists and
sometimes also SRS compliant forwarding.

We do score some points if a DKIM header with invalid signature is
present.

-Benoît Panizzon-
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